Samset E, Høgetveit J O, Cate G T, Hirschberg H
The Interventional Centre, Rikshospitalet, University Hospital, Oslo, Norway.
Minim Invasive Neurosurg. 2005 Apr;48(2):73-6. doi: 10.1055/s-2004-830224.
Recently, MRI has entered the field of image-guided surgery as a new intraoperative imaging modality. In spite of its obvious benefits, this type of iMRI scanner has some drawbacks that have limited its utilization. The goal of the work presented here was to overcome some of these disadvantages.
A system that allows intraoperative images to be acquired during surgery and have the ability to conduct surgery outside the constraints of the narrow gap of the open magnet was implemented. Ability to conduct tasks inside the scanner with real-time image guidance was also maintained. The system allowed navigation with neuronavigation tools both inside the gap of an open magnet and outside the magnet, utilizing two different optical camera-sets and a dynamic reference frame. Automatic patient registration was implemented.
The average difference between tracking position measured outside and inside the magnet was 0.8 +/- 0.1 mm.
In the work presented in this note we have introduced a dynamic reference frame to compensate for transport of the patient to a location outside the scanner employing a second camera set. The integrated system showed adequate accuracy.
最近，磁共振成像（MRI）作为一种新的术中成像方式已进入图像引导手术领域。尽管其有明显优势，但这种类型的术中MRI扫描仪存在一些缺点，限制了其应用。本文介绍的工作目标是克服其中一些缺点。
实施了一个系统，该系统允许在手术过程中获取术中图像，并能够在开放磁体狭窄间隙的限制之外进行手术。同时还保持了在扫描仪内部利用实时图像引导执行任务的能力。该系统允许使用两种不同的光学摄像头组和一个动态参考框架，在开放磁体的间隙内和磁体外部使用神经导航工具进行导航。实现了自动患者配准。
磁体外部和内部测量的跟踪位置的平均差异为0.8±0.1毫米。
在本报告介绍的工作中，我们引入了一个动态参考框架，以补偿使用第二组摄像头将患者转移到扫描仪外部位置的情况。该集成系统显示出足够的准确性。
